单项选择题

The idea（）we invited him yesterday is quite good.

A. that
C. what
B. which
D. when

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单项选择题
I feel that one of my main duties（）a teacher is to help the students to become better learners.

A. for
C. as
B. by
D. with
填空题
Why are London taxi drivers very efficient Because they have received a ______.
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